lkml.org 
[lkml]   [2012]   [Feb]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[ 10/72] S390: correct ktime to tod clock comparator conversion
3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Martin Schwidefsky <schwidefsky@de.ibm.com>

commit cf1eb40f8f5ea12c9e569e7282161fc7f194fd62 upstream.

The conversion of the ktime to a value suitable for the clock comparator
does not take changes to wall_to_monotonic into account. In fact the
conversion just needs the boot clock (sched_clock_base_cc) and the
total_sleep_time.

This is applicable to 3.2+ kernels.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
arch/s390/kernel/time.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

--- a/arch/s390/kernel/time.c
+++ b/arch/s390/kernel/time.c
@@ -113,11 +113,14 @@ static void fixup_clock_comparator(unsig
static int s390_next_ktime(ktime_t expires,
struct clock_event_device *evt)
{
+ struct timespec ts;
u64 nsecs;

- nsecs = ktime_to_ns(ktime_sub(expires, ktime_get_monotonic_offset()));
+ ts.tv_sec = ts.tv_nsec = 0;
+ monotonic_to_bootbased(&ts);
+ nsecs = ktime_to_ns(ktime_add(timespec_to_ktime(ts), expires));
do_div(nsecs, 125);
- S390_lowcore.clock_comparator = TOD_UNIX_EPOCH + (nsecs << 9);
+ S390_lowcore.clock_comparator = sched_clock_base_cc + (nsecs << 9);
set_clock_comparator(S390_lowcore.clock_comparator);
return 0;
}



\
 
 \ /
  Last update: 2012-02-28 02:21    [W:0.319 / U:0.044 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site